so, there's a lot for the law enforcement officials to do. and we just have to differentiate between what they believe the suspect is telling them and what they believe they can verify and what might be the truth, anderson. >> also lawmakers want to talk to the fbi about their treatment of the older brother, tamerlan tsarnaev, about their interviews with him before he went to russia and any follow-up that they did or did not do, correct? >> yeah. and there's a whole list of questions there, of course, policymakers are asking and we're trying to get to the bottom of what really happened during before and after the time when tamerlan tsarnaev went to russia. federal law enforcement official, for example, this morning, telling cnn tamerlan was not on a terror watch list or any no fly list. that was something up for debate for a while. the official said that when the fbi looked at tamerlan, there was no derogatory information found and the u.s. never deemed him a threat. the official said when the russian government asked the fbi to look into him